Finding the Third Proportional to 131,912 and 212,700

Step by Step Solution

1. Step 1: Write the proportion equation
   131,912 : 212,700 = 212,700 : x
2. Step 2: Convert to fraction form
   131,912/212,700 = 212,700/x
3. Step 3: Cross multiply
   131,912x = 212,700 × 212,700
4. Step 4: Simplify right side
   131,912x = 45,241,290,000
5. Step 5: Solve for x
   x = 45,241,290,000/131,912
6. Step 6: Final answer
   x = 342,965.69